My 2015 z4 threw P0456 code. Already replaced purge valve and gas cap. Decided to stop buying parts I didn’t need. Built a smoke drive and ran a smoke test. Smoke is coming out this vent pipe when engine running and not. I sealed it off and confirmed smoke did not come out elsewhere. Since smoke is bellowing out the vent it makes me think it’s not doing it’s job. Appreciate your thoughts.
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